1 查看内核版本 uname -r
2 查看目前已有的kernel-devel
uname -a ; rpm -qa kernel\* | sort
3 下载对应版本
$ sudo yum install "kernel-devel-uname-r == $(uname -r)"
#安装成功会在/usr/src/kernel/下生成对应$(uname -r)目录
1、备份
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup
2、下载新的CentOS-Base.repo 到/etc/yum.repos.d/
CentOS 5
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
CentOS 6
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
CentOS 7
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo